EP0263026A1 - Elektrische Speiseanordnung einer Lichtquelle mit Halogenlampen - Google Patents

Elektrische Speiseanordnung einer Lichtquelle mit Halogenlampen Download PDF

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Publication number
EP0263026A1
EP0263026A1 EP87402164A EP87402164A EP0263026A1 EP 0263026 A1 EP0263026 A1 EP 0263026A1 EP 87402164 A EP87402164 A EP 87402164A EP 87402164 A EP87402164 A EP 87402164A EP 0263026 A1 EP0263026 A1 EP 0263026A1
Authority
EP
European Patent Office
Prior art keywords
power supply
supply device
brightness
light source
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87402164A
Other languages
English (en)
French (fr)
Other versions
EP0263026B1 (de
Inventor
Jacques Le Gars
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'etudes Pour Le Developpement Des Productions Electroniques SA Ste
Original Assignee
D'etudes Pour Le Developpement Des Productions Electroniques SA Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by D'etudes Pour Le Developpement Des Productions Electroniques SA Ste filed Critical D'etudes Pour Le Developpement Des Productions Electroniques SA Ste
Priority to AT87402164T priority Critical patent/ATE67062T1/de
Publication of EP0263026A1 publication Critical patent/EP0263026A1/de
Application granted granted Critical
Publication of EP0263026B1 publication Critical patent/EP0263026B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/042—Controlling the light-intensity of the source by measuring the incident light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a power supply device which is intended to power a light source which comprises halogen lamps.
  • Halogen lamps are used more and more because of their performance; it is used for example in signaling or display devices such as highway traffic signs. In the latter case, the panels are generally difficult to access and their maintenance poses problems. This is why it is desirable to increase the service life of the halogen lamps used in order to reduce the maintenance operations. Thus, for example, the lifespan of these halogen lamps is approximately 3000 hours, which entails maintenance operations several times a year.
  • the effectiveness of a display or signaling device is a function of the contrast with the ambient light and, for example in said motorway display panels, there is simply provided a "day" position in which the bulbs at halogen lamps are supplied with 12 V and a “night” position in which the halogen bulbs are supplied with 6 V. If the contrast is too high (greater than 7 or 8), there is a loss of visibility and the bulbs used are then supercharged, which also results in a loss of power.
  • the present invention therefore relates to an electrical power supply device for a light source comprising halogen lamps which makes it possible both to increase the life of the lamps and to increase the efficiency of the display devices or signaling using these lamps.
  • the feeding device is particularly remarkable in that it comprises a switching power supply unit whose output voltage is regulated by a regulator receiving a set value supplied from an ambient light detector and a real value supplied by a halogen light source brightness detector.
  • the switching power supply unit comprising a smoothing device, vibrations of the filament of the lamps which are generally supplied with alternating current at 50 Hz are eliminated and this results in an increase in their lifespan. Furthermore, the regulation makes it possible on the one hand to obtain the best performance from the display or signaling device using the halogen lamps and on the other hand, it makes it possible to limit the power supplied to the lamps; However, the life of halogen lamps increases when they are used at reduced power.
  • the switching power supply unit includes a current limiter. Thanks to this arrangement, the current passing through the filament is limited and thermal shocks are eliminated, in particular during the ignition of these halogen lamps, which is particularly advantageous for flashing display or signaling devices, since in this case, the halogen lamp is subjected to very frequent strikes.
  • the ambient light detector consists of several sensors which are arranged in different directions and whose signals are correlated with one another. In this way, the efficiency of the regulation can be improved significantly and the best use of halogen lamps can be obtained.
  • halogen lamps are chosen so that, when new, the maximum adjustment voltage is lower than their nominal operating voltage. In this way, halogen lamps are used at reduced power, at least when they have not undergone significant aging.
  • the power supply device may include an aging detector constituted by a comparator which compares the actual brightness supplied by the lamp for the maximum adjustment voltage with a stop signal corresponding to a brightness value lower than that supplied by a new lamp for the same maximum adjustment voltage and which provides an alarm when the value of the actual brightness supplied by the lamp becomes lower than the abovementioned stop signal.
  • This alarm warns that the halogen lamp has aged so that it will no longer be possible to provide the optimal contrast when the ambient light is at its maximum.
  • the value of the stop triggering the alarm can be chosen equal to or greater than the maximum possible value of the brightness that can be provided by the lamp. Indeed, the eye being sensitive only to variations in light which are at least equal to 2, it is therefore possible to choose a stop corresponding to 50% of the brightness provided by a new lamp for the maximum adjustment voltage, which further increases the operating time of the lamp.
  • the actual value of the brightness can be measured by means of an optical fiber connecting at least one halogen lamp to the brightness detector of the light source.
  • halogen lamps in the case where the halogen lamps supply a bundle of optical fibers constituting for example display points, halogen lamps having a high focal distance are used, which makes it possible to use a bundle of optical fibers synthetic material; the use of optical fibers of synthetic material instead of optical fibers of glass makes it possible to considerably reduce the cost price of the display or signaling device using the light source with halogen lamps.
  • the ambient light detector may consist of a sensor directed towards the front of the panel, a sensor directed towards the rear of the panel and d '' a sensor directed upwards.
  • FIG. 1 shows a display device which comprises a light source 1 comprising at least one halogen lamp or bulb which illuminates a bundle of optical fibers 2, the various optical fibers supplying individual light display elements.
  • a light source 1 comprising at least one halogen lamp or bulb which illuminates a bundle of optical fibers 2, the various optical fibers supplying individual light display elements.
  • It may for example be a display device as described in French patent application 85 11 176 of July 22, 1985 and which comprises a matrix of dots each constituted by an elementary display cell comprising a plate having a reflecting face and a black face, said plate being pivotally mounted between an active position or it has the reflecting face and a rest position where it has the black face, the end of an optical fiber being disposed behind said plate which has a hole arranged opposite from the end of said optical fiber when said plate is in the active position.
  • the electrical supply of the various halogen bulbs is carried out by means of a switching power supply unit 3 which includes a smoothing device so as to provide an almost continuous average voltage.
  • a regulator 4 of the output voltage of the power supply unit 3 is provided.
  • This regulator firstly receives a confined value which is supplied by an ambient light detector.
  • This detector comprises several sensors 5, 3 in the example shown, the output signals of which are correlated in a circuit 6 so as to obtain a reference value representative of the ambient brightness.
  • the regulator 4 also receives a signal corresponding to the actual value of the brightness supplied by the light source 1; this real value is supplied by a sensor 7 which, in the case of a light source supplying a bundle of optical fibers is supplied by an optical fiber 8 of the bundle 2.
  • the halogen lamps used in the light source 1 are chosen so that when they are new, the maximum adjustment voltage, that is to say the voltage corresponding to a one hundred percent cut the power supply unit 3 is lower than their nominal operating voltage.
  • the maximum adjustment voltage that is to say the voltage corresponding to a one hundred percent cut the power supply unit 3 is lower than their nominal operating voltage.
  • an aging detector which provides an alarm when the actual value of the brightness of the light source for the maximum adjustment voltage becomes less than a brightness value than that provided by a new lamp for this same voltage. maximum adjustment.
  • this stop detector essentially comprises a comparator 9 which receives on the one hand the signal supplied by the sensor 7 of actual brightness and on the other hand an adjustable stop value supplied by a circuit 11.
  • the said bulb is supplied with power at the maximum operating voltage (100% switching) and if the value of the signal supplied by the sensor 7 is less than the value of the stop signal supplied by the circuit 11, the comparator 9 acts on an alarm circuit 12 which can provide a visual alarm or even provide an alarm to a central monitoring system by a telecommunication device.
  • the stop provided by the circuit (11) can be chosen to correspond to at least 50% of the brightness provided by a new lamp for the maximum adjustment voltage. Indeed, a 50% drop in brightness is barely perceived by the human eye.
  • the power supply unit includes a current limiting circuit, which makes it possible to suppress current spikes, in particular when the bulbs are primed; these current peaks actually cause significant thermal shock to the filament of the bulb.
  • a current limiting circuit which makes it possible to suppress current spikes, in particular when the bulbs are primed; these current peaks actually cause significant thermal shock to the filament of the bulb.
  • halogen bulbs are chosen whose focal length is large; this allows the end of the bundle 2. It is then possible to use optical fibers made of synthetic material instead of glass optical fibers, which makes it possible to limit the cost price in a significant proportion.
  • FIG. 2 shows another example of application of the invention to a display and / or signaling device which comprises a light source 21 which comprises several halogen bulbs 22 whose light energy is used directly without interposition of optical fibers. It may for example be a flashing signaling device.
  • the power supply unit 3 includes a current limiter.
  • 23 shows a control unit for the blinking operation of the source 21.
  • the real value of the brightness is obtained by means of a controller 24 disposed near one of the bulbs 22.
  • the invention makes it possible to significantly increase the life of the halogen bulbs used in display and signaling devices, which in particular results in a significant reduction in maintenance operations and the possibility of eliminating spare bulbs. Furthermore, the light sources according to the present invention have a greatly reduced structure and cost price since the elimination of spare bulbs reduces the number of components.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Stringed Musical Instruments (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Endoscopes (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP87402164A 1986-09-30 1987-09-29 Elektrische Speiseanordnung einer Lichtquelle mit Halogenlampen Expired - Lifetime EP0263026B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402164T ATE67062T1 (de) 1986-09-30 1987-09-29 Elektrische speiseanordnung einer lichtquelle mit halogenlampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613582A FR2604540B1 (fr) 1986-09-30 1986-09-30 Dispositif d'alimentation electrique d'une source lumineuse utilisant des lampes a halogene
FR8613582 1986-09-30

Publications (2)

Publication Number Publication Date
EP0263026A1 true EP0263026A1 (de) 1988-04-06
EP0263026B1 EP0263026B1 (de) 1991-09-04

Family

ID=9339384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402164A Expired - Lifetime EP0263026B1 (de) 1986-09-30 1987-09-29 Elektrische Speiseanordnung einer Lichtquelle mit Halogenlampen

Country Status (8)

Country Link
EP (1) EP0263026B1 (de)
AT (1) ATE67062T1 (de)
DE (1) DE3772694D1 (de)
ES (1) ES2024535B3 (de)
FI (1) FI86357C (de)
FR (1) FR2604540B1 (de)
NO (1) NO170178C (de)
PT (1) PT85841B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997008600A1 (de) * 1995-08-23 1997-03-06 Signalbau Huber Ag Anpassschaltung für ein elektronisches bauteil oder eine baugruppe
EP1098178A2 (de) * 1999-11-04 2001-05-09 Teknoware Oy Leuchtdichtenregelung einer beleuchteten Fläche
CN109300319A (zh) * 2018-09-29 2019-02-01 扬州市法马智能设备有限公司 一种地埋式人行横道灯

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2313837A1 (fr) * 1975-05-27 1976-12-31 Esquire Inc Regulateur automatique d'un eclairage
US4234820A (en) * 1979-04-06 1980-11-18 Controlled Environments Systems Light regulation system
US4347461A (en) * 1980-10-23 1982-08-31 Robert L. Elving Incident illumination responsive light control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2313837A1 (fr) * 1975-05-27 1976-12-31 Esquire Inc Regulateur automatique d'un eclairage
US4234820A (en) * 1979-04-06 1980-11-18 Controlled Environments Systems Light regulation system
US4347461A (en) * 1980-10-23 1982-08-31 Robert L. Elving Incident illumination responsive light control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997008600A1 (de) * 1995-08-23 1997-03-06 Signalbau Huber Ag Anpassschaltung für ein elektronisches bauteil oder eine baugruppe
EP1098178A2 (de) * 1999-11-04 2001-05-09 Teknoware Oy Leuchtdichtenregelung einer beleuchteten Fläche
EP1098178A3 (de) * 1999-11-04 2004-03-17 Teknoware Oy Leuchtdichtenregelung einer beleuchteten Fläche
CN109300319A (zh) * 2018-09-29 2019-02-01 扬州市法马智能设备有限公司 一种地埋式人行横道灯

Also Published As

Publication number Publication date
FI874268A0 (fi) 1987-09-29
PT85841A (pt) 1988-10-14
FI874268A (fi) 1988-03-31
ES2024535B3 (es) 1992-03-01
DE3772694D1 (de) 1991-10-10
FI86357C (fi) 1992-08-10
FR2604540B1 (fr) 1989-07-07
PT85841B (pt) 1994-01-31
FR2604540A1 (fr) 1988-04-01
NO874082L (no) 1988-04-05
NO874082D0 (no) 1987-09-29
NO170178B (no) 1992-06-09
NO170178C (no) 1992-09-16
EP0263026B1 (de) 1991-09-04
FI86357B (fi) 1992-04-30
ATE67062T1 (de) 1991-09-15

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